Microchip LX7180A Manual

Microchip Ikke kategoriseret LX7180A

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Side 1/25

June 2015 Rev. 1.2 www.microsemi.com 1

4A Step Down Regulator-

VIN

GND

10 µF

X5R

500 k

PGOOD

PVIN

PGND AGND

SDA

0.47 µH

22 µF,

X5R

VOUT

GND

1, 10

2, 11

3, 12

LX7180A

SCL 5

10 µF

X5R

Figure 1 · Typical Application of LX7180A

Features

 0- -4 A Step down Regulator

 Operational Input Supply Voltage Range:

3.0 V 5.5 V (short durations to 6.5 V) -

 Hysteretic Control Offers Best Transient Response

 PWM Switching at a Constant 1.65 MHz

 Power Save Mode (PSM) can be Selected to

Improve Light Load Efficiency.

 O100% atio Duty R peration

 Input Under Voltage and Over Voltage Protection

 Enable and Power Good Function

 I2C Serial Interface at 3.4 Mbps

 S - Internal oft start

 C - -ycle by Cycle Over Current Protection

 Hiccup Mode Protects Against Short Circuit Faults

 Seven Bit Adjustable Reference Voltage via I2 C Bus

 RoHS Compliant

Applications

 High Performance HDD

 LCD TV

 Notebook/Netbook

 Server and Workstations

 Video Cards

 PoE Powered Devices Smart Phone

Description

The LX7180A is a 4A step-

down regulator with

integrated MOSFETs packaged in a space saving

QFN12 2 mm x 2 mm for today’s mobile devices. It uses

an ultra-

fast, constant frequency hysteretic control

method to minimize external filter components while

maintaining excellent regulation. The LX7180A reference

voltage is programmable from 0.6 V to 1.195 V through a

high speed (up to 3.4 MHz), bi directional I- 2C bus.

The LX7180 operates from 3 V to 5.5 V rails and outputs

0.6 V to 100% of the input voltage.

Cycle-by-cycle current limiting protects against over-

current conditions. Hiccup mode provides protection for

heavy over-load or short-

circuit faults. Thermal

protection shuts down the regulator under over-

temperature

conditions. Over voltage conditions will

immediately shut off the output to protect against

permanent damage. The LX7180A automatically restarts

when all fault conditions are cleared.

LX7180A

Produkt Specifikationer

Mærke:	Microchip
Kategori:	Ikke kategoriseret
Model:	LX7180A

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